Automatic circulator for steam-boilers.



A. MoNAB.

AUTOMATIG GIRGULATOR FOR STEAM BOILERS.

APPLICATION FILED JULY18,1913.

Patented July 14, 19%

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I A- MCNAB- AUTOMATIC GIRGULATOR FOR STEAM BQILERS.

APPLICATION FILED JULY 18, 1913- Patented July 14,1914.

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A. MoN AB.

AUTOMATIC 'GIRGULATOR FOB. STEAM BOILERS.

APPLICATION IILED JULY 18, 1913.

Patented July 14, 1914,

THE mamas versus w ITED WENT OFFICE.

ALEXANDER MQNAB, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE M NABCOMPANY, OF BRIDGEPORT, CONNECTICUT, A COREOR-ATION OF CONNECTICUT.

AUTOMATIC CIRCULATOR FOR STEAM-BOILERS.

Specification of Letters Patent.

Application filed July 18, 1913.

To all whom it may concern Be it known that I, ALEXANDER MCNAB, acitizen of Great Britain, residing in the city of Bridgeport, county ofFairfield, State of Connecticut, United States of America, have inventedcertain new and useful Improvements in Automatic Circulators for Steam-Boilers; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to certain new and useful improvements inautomatic circulators for boilers and relates more particularly to whatis generally known as. the Scotch type of boilers.

The primary object of the invention is to provide a circulator which maybe adjusted so as to conform to various types of boilers possessindifferent characteristics in order that the how of water may becontrolled in the most advantageous manner for the purpose of preventingpriming.

Further the invention aims to provide a circulator which occupiesminimum space, and one which is held in position relative to the boilerby simple attaching means, in. order to not only permit ease andrapidity of in sulation, but to also allow movement of the circ-ulatorwith relation to the boiler for the purpose of cleaning or inspection.

Further and other objects will later be set forth and will manifestthemselves in course of the following description.

In the drawing: Figure l is a vertical longitudinal sectional view ofaboiler equipped with the present invention; Fig. 2 is a fragmentaryenlarged side elevation partly in section; Fig. 3 is a top plan view ofFig. 2; Fig. e is a section taken on the line 4:4 of Fig. 2; Fig. 5 is adetail perspective view of one of the sections of one of the sideplates; and Fig. 6 is a detail perspective view of one of the deflectorblades.

In proceeding in accordance with the present invention, two side platesare employed which extend longitudinally of the boiler, and which aregenerally designated 1, in the drawings, each side plate being formed ofa plurality of sections 2. The

sections are provided with end flanges c which abut and are secured toeach other by bolts 4:, for convenience in installation. One of thesections 2 adjacent the combustion chamber C is formed with a curved endplate 5 which latter extends at right angles to that section and engagesthe companion section 2 located opposite to the section which has saidend plate5. Feet 6 are formed 011 the lower sides of each of the sideplates 1 at the ends of the latter, and comformably engage the uppermostand preferably the outermost fire tubes T as more clearly illustrated inFig. 4 of the drawings. Each of the side plates 1 has two, or optionallymore, outwardly extending perforated horizontal lugs 7, which lugsengage with the nuts 8 of hook bolts 9. The threaded ends I of the hookbolts 9 are passed through the apertures of lugs 7 and the hooked endsthereof are engaged under the fire tubes T above mentioned, whereby itwill be evident that upon proper rotation of the nuts 8 the side plates1 will be moved downwardly and the hooked ends of the bolts 9 movedupwardly so as to firmly and rigidly secure the side plates to theaforementioned fire tubes T.

The side plates 1 are arranged in parallelism and are formed withapertures 10 in which latter the pivots 11 of the blades 12 project. Theblades 12 bridge the spaces be tween the side plates 1 and have theirlower ends formed with downturned edges 13. On the outer end of each ofthe pivots 11 at one of the ends of the blades, crank arms 14 areattached, which crank arms are connected by means of a horizontal rod15. The rod 15 extends on the outer side of the adjacent side plate 1,and has one end thereof threaded to receive a'nut 16, said threaded endof the rod passing through the aperture of a boss 17 that is carried byone of the side plates 1. It will be evident that by manipulation of thenut 16, the rod 15 may be reciprocated in order to simultaneously varythe angular relationship of each of the blades 12 with respect to thetire tubes. It will also be I apparent from Fig. 2 of the drawings thatthe feet 6 sustain the lower sides of the side plates 1 above and inspaced relation to the adjacent portions of the fire tubes T, in ordertoallow water to circulate through the space mentioned.

The. roof of the combustion chamber is preferably provided with a seriesof dogs vent any possible collapse thereof, ,thisex pedient being onethat is well known and commonly used in boilers of this type.

forward deflection of the vertical column of waterC adjacent said rearwall, as will be I evident upon inspection of Fig. 1 of the drawings.It' should be understood however, that the 'deflector just described isnot essential "or necessary to the invention, though it may beoptionally utilized if de sired.

By reference to Fig. 1 of the drawings it will be observed that theblades are preferably arranged in the manner therein shown, that is tosay the lower blades have their upper edges turned somewhat to the rearof the boiler, while the upper blades have their lower edges turnedsomewhat to the front of the boiler in order to better deflect thewater. it will also be evident. that the blades in roximity to thecombustion chamber are arranged in closer relation to each other thanare the blades more remotely sit- 'uated with respect to'the combustionchamber.. It will further be observed that each rod 15 effectssimultaneous adjustment of the series of blades.

The operation may be briefly summarized with the roof B of the firechamber or fire box 13 it rapidly rises upwardly and impinges againstthe *lower set of blades of the circulator, and the latter, owing totheir rearward inclination deflect the water against the front wall'C ofthe combustion chamber, whereupon the water rises with exceedingrapidity and impinges against the blades of theupper set of blades, andis deflected by :the latter toward the frontof the boiler, whereupon thewater will descend and again contact with the roof B and pursue thecourse of travel above described ad infinitam. In Fig. 1 of the drawingsit will be observed that the course of the water is therein depicted bystraight arrows, while undulating arrows indicate 7 the path oftravel'ofthe heat. It will be also apparent from the above, that anytendency of the water to foam upwardly, may be corrected by altering thedegree of inclination of the blades to cause same to near horizontaldisposition, as distinguished from vertical disposition, -thusdecreasing the rapidity of rise of the water, by causing same topursuefa more nearly horizontal path of travel. The present invention isof particular advantage for correcting priming tendencies, since, due tovarying characteristics possessed by different boilers, some prime morethan others, and by use of the presentinvention, the oh- 3 water, whichwill obviate any possibility of A stationary deflector 19 may beemployed and secured by any approved means to the rear wall of theboiler so as to insure proper,

jectionin question can not only be remedied, but completly eliminated byadjusting the degree vof inclination of the blades, until the latterprescribe paths of travel for the foaming.

The water directly above the combustion chamber has no tendency to foam,due to the comparatively small heating surface that the combustionchamber roof provides, and in addition, the upper series of bladescreate'an extremely strong current which draws the water from above thecombustion, chamber, by induction, toward the boiler front, and thecombined currents, created as noted, in turn draw the vertical column ofwater (indicated C) toward the boiler front, effecting rapid circulationof the entire body of water, as depicted in Fig.1 of the drawings. Asabove stated the deflector 19 may be utilized to assist in forwardtravel of the vertical column of water, just referred to, though it mayalso be omitted, optionally either way.

A further material and decided advantage of the present invention is theease and rapidity with which the circulator may be removed or installed,the removal being periodically necessitated in order to cleanse theboiler of deposits made bythe water, which 95 causes the formation ofscale, and general corrosion. The removal of the circulator isaccomplished by mere loosening of the nuts 8 to relax the grip of thefeet and hooks of the hook bolts on the fire tubes, whereupon 100 theupper and lower blades, with the side plates and connected parts, may heslid as units to the front of the boiler, leaving the parts free ofobstruction so as to be easily cleaned. j

The circulator blades 12 are located closer together as the wall 0' ofthe combustion chamber C is approached, for the reason that the heat ismore intense adjacent this wall, andtherefore the upward current of thewa- 110 ter is proportionately accelerated, and requires deflectionaccordingly. The current of water toward the front of the boiler wherethe intensity of the heat becomes less and less, is so comparativelysluggish that 115 it is readily influenced by the rapidly mov- 3. In aboiler circulator, water deflecting 130 means, and means rigidlyconnected to the boiler tubes for movably supporting said deflectingmeans to permit adjustment of the latter.

4.. In a boiler circulator, a pair of spaced side plates, means torigidly connect said plates to the boiler tubes, a series of bladesextending transversely of the plates and connected at their ends to thelatter, and means conneced to each of the plates for moving all of samein unison to vary the angular relationship between the plates andblades.

5. In a boiler circulator, water deflecting means arranged above andbelow the boiler tubes, and extending transversely of the tubes, andmeans to adjust said means to vary the angular relationship between sameand the boiler tubes.

6. In a boiler circulator, side plates having feet which seat on theupper surfaces of the fire tubes, perforated lugs borne by the plates,hook bolts having the hooks thereof engaged with the lower surfaces ofthe fire tubes and having their threaded ends passed through theperforations of said lugs, nuts on the threaded ends of the bolts andengaged with the lugs, and pivoted water deflecting blades supported bysaid plates.

7 In a boiler circulator, a pivoted water deflector adjustable to varythe angular relationship between same and the fire tubes.

8. In a boiler circulator, a series of pivoted water deflectors, andmeans to move said deflectors in unison to thereby vary the angularrelationship between same and the fire tubes.

9. In a boiler circulator, two series of spaced water deflectin bladesarranged re spectively above and below the fire tubes, the bladesadjacent the combustion chamber being located closer together than theremaining blades.

10. In a boiler circulator, two series of spaced water deflecting bladesarranged respectively above and below the fire tubes, and means toenable adjustment of the blades of each series to vary the angularrelationship which same bear to the fire tubes, the blades adjacent thecombustion chamber being located closer together than the remainingblades.

11. In a boiler circulator, a pair of side plates alined with and formedat their bottom sides with means to seat on two of the fire tubes, meansto removably clamp said seating means to the fire tubes, whereby whenthe clamping means is loosened the plates may be slid or movedlengthwise of the fire tubes, and a series of water deflecting bladessecured at their ends to the plates and arranged in the space betweensaid plates.

In testimony whereof I afiix my signature in presence of two witnesses.

ALEXANDER MGNAB.

Witnesses:

F. W. SMITH, Jr., M. T. LONGDEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner otlatents,

Washington, D. 0."

